CVE-2026-56705 vrana CVE debrief

Who should care

Defenders responsible for Adminer installations, security teams, and developers should assess exposure and prioritize remediation. This includes reviewing and updating affected systems, implementing compensating controls, and monitoring for suspicious activity. IT operations teams and incident response teams may also need to be involved in the remediation and mitigation efforts.

Why it matters

CVE-2026-56705 is a critical vulnerability in Adminer that allows unauthenticated attackers to inject ODBC parameters, potentially leading to remote code execution. Defenders should prioritize verifying Adminer versions, sanitizing user input, and implementing compensating controls to prevent exploitation.

• Remote code execution when the trace file is accessed
• Unauthenticated attackers can inject ODBC parameters via semicolons
• Write PHP code to the web root using TraceFile and TraceOn parameters

Technical summary

Adminer before 5.4.3 fails to sanitize the server field before constructing a PDO DSN string, allowing unauthenticated attackers to inject ODBC parameters via semicolons. Attackers can inject TraceFile and TraceOn parameters to write PHP code to the web root, achieving remote code execution when the trace file is accessed. The vulnerability is a result of improper input validation and sanitization in the Adminer application. Defenders should prioritize verifying Adminer versions and sanitizing user input to prevent ODBC parameter injection.

Defensive priority

Defenders should prioritize verifying Adminer versions and sanitizing user input to prevent ODBC parameter injection.

Recommended defensive actions

• Verify Adminer version and upgrade to 5.4.3 or later
• Sanitize user input to prevent ODBC parameter injection
• Monitor for suspicious activity and implement compensating controls
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, but vendor statements and additional sources are limited. The vulnerability was publicly disclosed on 2026-08-25 and has not been modified since then. The CVE Program and NVD provide official records and assessments of the vulnerability. Additional sources may be necessary to fully understand the vulnerability and its impact.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.